----- TP20 : Structures -----

1. 

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main (void) {
	time_t timestamp = time(NULL);
	struct tm* date = localtime(&timestamp);

	printf("%04d/%02d/%02d", date->tm_year+1900, date->tm_mon+1, date->tm_mday);
}


2.

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

struct enregistrement {
	char a;
	char b;
	char c;
};

int main (void) {
	struct enregistrement test = {'Z', 'i', 'o'};
	printf("Taille du 1er élément : %zu \nTaille du 2e élément : %zu \nTaille du 3e élément : %zu \n", sizeof(test.a), sizeof(test.b), sizeof(test.c));
}

3.

#include <stdio.h>
#include <stdlib.h>
#include <pwd.h>


int main (void) {
	struct passwd* id = getpwnam("simoes");
	printf("UID : %d\n", id->pw_uid);
}

4.


#include <stdio.h>
#include <stdlib.h>
#include <math.h>

struct imaginaire {
	int x;
	int y;
};

struct imaginaire conjugue(struct imaginaire z) {
	struct imaginaire z_conjugue;
	z_conjugue.x = z.x;
	z_conjugue.y = z.y * -1;
	return z_conjugue;
}

double module(struct imaginaire z) {
	return sqrt((z.x*z.x) + (z.y*z.y));
}

void afficher_imaginaire(struct imaginaire z) {
	if (z.y < 0) {
		printf("%d - %di", z.x, z.y*-1);
	} 
	else {
		printf("%d + %di", z.x, z.y);
	}
	putchar('\n');
}

void inverse(struct imaginaire z) {
	printf("1 / ");
	afficher_imaginaire(z);
}

int main (void) {
	struct imaginaire test = {4, 8};
	afficher_imaginaire(test);
	afficher_imaginaire(conjugue(test));
	printf("%f\n",module(test));
	inverse(test);
}